Determine the polarity of molecules using molecular shape, understanding of symmetry, and comparison of the electronegativity of elements.

Determine whether the molecule boron trifluoride (BF₃) is polar or nonpolar. Support your answer by identifying the molecular shape and explaining how electronegativity differences and symmetry combine to give this polarity.

Determine which of the following molecules is non-polar despite containing polar bonds.

Determine which molecule is nonpolar despite having polar bonds.